132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
#include "FreeRTOS.h"
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#include "stm32f1xx.h"
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#include "task.h"
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#include "tusb.h"
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void SystemClock_Config(void) {
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// 1. Включаем HSE (внешний кварц 8 МГц)
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RCC->CR |= RCC_CR_HSEON;
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while (!(RCC->CR & RCC_CR_HSERDY));
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// 2. Настраиваем Flash: 1 цикл ожидания (достаточно для 48 МГц)
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FLASH->ACR = FLASH_ACR_LATENCY_1;
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// 3. Настраиваем PLL:
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// Множитель x6: 8 МГц * 6 = 48 МГц
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RCC->CFGR &= ~RCC_CFGR_PLLMULL; // Сброс битов множителя
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RCC->CFGR |= RCC_CFGR_PLLMULL6;
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// Источник PLL = HSE
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RCC->CFGR |= RCC_CFGR_PLLSRC;
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// 4. Настраиваем USB делитель:
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// USBPRE = 1 (делитель /1). Т.е. 48 МГц / 1 = 48 МГц
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RCC->CFGR |= RCC_CFGR_USBPRE;
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// 5. Включаем PLL
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RCC->CR |= RCC_CR_PLLON;
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while (!(RCC->CR & RCC_CR_PLLRDY));
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// 6. Переключаем системную частоту на PLL
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RCC->CFGR &= ~RCC_CFGR_SW;
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RCC->CFGR |= RCC_CFGR_SW_PLL;
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while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
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// Обновляем глобальную переменную частоты
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SystemCoreClock = 48000000;
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}
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// Задача USB
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void usb_device_task(void *param) {
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(void)param;
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while (1) { tud_task(); }
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}
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// Задача CDC
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void cdc_task(void *param) {
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(void)param;
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while (1) {
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if (tud_cdc_connected()) {
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if (tud_cdc_available()) {
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uint8_t buf[64];
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uint32_t count = tud_cdc_read(buf, sizeof(buf));
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tud_cdc_write(buf, count);
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tud_cdc_write_flush();
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}
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}
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vTaskDelay(pdMS_TO_TICKS(10));
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}
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}
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// Задача LED (отдельно!)
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void led_task(void *param) {
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(void)param;
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while (1) {
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GPIOC->BSRR = GPIO_BSRR_BR13; // LED ON
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vTaskDelay(pdMS_TO_TICKS(500));
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GPIOC->BSRR = GPIO_BSRR_BS13; // LED OFF
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vTaskDelay(pdMS_TO_TICKS(500));
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}
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}
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void force_usb_reset(void) {
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
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GPIOA->CRH &= ~GPIO_CRH_CNF12;
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GPIOA->CRH |= GPIO_CRH_MODE12_1;
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GPIOA->BSRR = GPIO_BSRR_BR12;
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for (volatile int i = 0; i < 500000; i++) __NOP();
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GPIOA->CRH &= ~GPIO_CRH_MODE12;
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GPIOA->CRH |= GPIO_CRH_CNF12_0;
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}
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int main(void) {
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SystemClock_Config();
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// Настройка LED
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RCC->APB2ENR |= RCC_APB2ENR_IOPCEN;
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GPIOC->CRH &= ~GPIO_CRH_CNF13;
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GPIOC->CRH |= GPIO_CRH_MODE13_1;
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force_usb_reset();
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// Включаем USB
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
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RCC->APB1ENR |= RCC_APB1ENR_USBEN;
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// Устанавливаем приоритет USB прерываний больше 5, больше FreeRTOS
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NVIC_SetPriority(USB_HP_CAN1_TX_IRQn, 6);
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NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 6);
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NVIC_SetPriority(USBWakeUp_IRQn, 6);
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NVIC_EnableIRQ(USB_HP_CAN1_TX_IRQn);
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NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
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NVIC_EnableIRQ(USBWakeUp_IRQn);
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tusb_init();
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xTaskCreate(
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usb_device_task,
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"usbd",
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256,
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NULL,
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configMAX_PRIORITIES - 1,
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NULL);
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xTaskCreate(cdc_task, "cdc", 256, NULL, configMAX_PRIORITIES - 2, NULL);
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xTaskCreate(led_task, "led", 128, NULL, 1, NULL);
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vTaskStartScheduler();
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while (1);
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}
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void USB_HP_CAN1_TX_IRQHandler(void) {
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tud_int_handler(0);
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}
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void USB_LP_CAN1_RX0_IRQHandler(void) {
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tud_int_handler(0);
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}
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void USBWakeUp_IRQHandler(void) {
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tud_int_handler(0);
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}
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